Daewoo DV6T812N Service Manual page 18

A. b. LINE1 E-E
No sound in LINE1 E-E
mode.
YES
Is 12V obtained at IC251
pin#34?
YES
Is 5V obtained at IC251
pin#40?
Is Audio signal at IC251
pin#6, 7 in LINE1 mode?
Is Audio signal output at IC251
pin#19, 20?
Is there Audio IC252 pin#5, 14?
YES
Is RF Audio signal output at
IC252 pin#3,13?
YES
C at Q258 is L or H?
L
Check Output JACK.
NO
NO
NO
NO
IC601 pin#27
H
Check
H
A.Mute is L or
IC601.
H?
L
Check
Q257,Q258,R2
40,R241,R242.
Are CLK and DATA obtained at
IC251 pin#42,43?
Check signal flow circuit from
IC251 to IC252.
Is 12V obtained at IC252
pin 16?
YES
IC601 pin#20 is H,
pin#21is L?
YES
Is about 3.5V obtained
at IC252 pin#9?
Is about 8V obtained at
pin #10?
YES
Replace IC252.
17
TROUBLESHOOTING
Check POWER circuit.
Check Input LINE1
JACK
NO
Replace IC251
NO
Check POWER circuit.
NO
Check IC601.
NO
Check R298, R299, R646,
R647.